Kind of echo The Heff's sentiments: I didn't fly for 16 years and as much as I'd like to think it was all due to lack of money, it wasn't entirely. Some of it was also that I couldn't find a use for it and it didn't challenge me or excite me as much anymore. Now having gotten back into it again for a few years, I can tell you I'm more obsessed with it than ever. Surely my economical situation has improved, but it's also due to the fact that I started using airplanes to go places. And touring for work or recreation, seeing new places, meeting new challenges keeps me on my toes and interested constantly.
I've also started my instrument training in my own aircraft and this is very exciting. I would recommend two things if you're in a rut: buy an aircraft and go places outside of your comfort zone. Or get a new license or rating, even if it's just a seaplane rating.